How are the coolant and the engine made to reach their optimum operating temperature quickly and efficiently?

Question

DentroTest · Accepted Answer

The liquid cooling system has a regulating valve called the thermostat. When the engine starts cold, the thermostat stays closed and prevents the coolant from passing to the radiator, so that it circulates only through the engine and reaches its operating temperature sooner. Once it is reached, the valve opens and sends the hot fluid to the radiator to dissipate the excess heat. Revving a cold engine at a medium or high speed right after starting is not the way to warm it up: with the oil still thick, wear increases. And preventing the fluid from passing to the heating circuit is not the mechanism used to speed up warming; that role is played by the closed thermostat.

How are the coolant and the engine made to reach their optimum operating temperature quickly and efficiently?

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